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The engine's design is unusual; the core flow path is reversed twice. Aft of the fan, the axial compressor has five stages, after which the gas path progresses to the aft end of the engine. There, it is reversed to flow through a centrifugal compressor stage, the combustors and then the turbine stages.
The combustion chamber was connected to the compressor outlet by a very large single spiral duct giving the engine an asymmetrical appearance. Whittle designed the centrifugal compressor to develop about 4:1 pressure ratio when, as far as he was aware, the best previously demonstrated performance in a single stage was about 2.5:1.
This means that the generally inferior flow of a reverse-flow head is less of a disadvantage. In the early days of turbo charging a reverse-flow head allowed the compressor outlet of a turbocharger to blow directly into the inlet manifold with either a blow-through or draw-through carburettor and no intercooler. This allowed the use of shorter ...
Further gas flow in the case of pressure shocks. The entry of air or oxygen into the distribution line or single cylinders. Flashbacks which are the rapid propagation of a flame down the hose. Further gas flow in the event of a burnback. According to the standard DIN EN ISO 5175-1 (formerly EN 730-1) they include a minimum of two safety elements:
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A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
Reverse flow may refer to: In engine technology a reverse flow cylinder head is one that locates the intake and exhaust ports on the same side of the engine. Reverse logistics, i.e. goods/waste flowing in the distribution network having consumers as point of origin; Reverse electron flow is a mechanism in microbial metabolism
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